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Process for fibrillating lignocellulosic material, fibres and their use

Inactive Publication Date: 2013-03-07
UNIVERSITY OF HELSINKI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a process and product using ionic liquids to treat wood and other plant materials. The benefits of this technology include reduced emissions of harmful volatile organic compounds, improved fibrous properties, and increased efficiency in extracting useful components from the wood. The process also allows for mild delignification without the need for sulfur, resulting in a cleaner and more flexible wood material. The invention also provides a way to study and modify the structure of wood components for improved performance and utilization of renewable wood reserves.

Problems solved by technology

The quality of these fibres, as pulp, is generally low, due to their high lignin content.
This degradation may allow for more efficient fractionation, however, the nature of the resulting polysaccharide materials is changed so drastically that it is rendered useless for traditional pulping applications.

Method used

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  • Process for fibrillating lignocellulosic material, fibres and their use
  • Process for fibrillating lignocellulosic material, fibres and their use
  • Process for fibrillating lignocellulosic material, fibres and their use

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of 1-methyl-3-methylimidazolium dimethylphosphate ([mmim]Me2PO4)

[0070]A mixture of 1-methylimidazole (50 ml, 0.519 mol) was added over a space of 4 hrs to trimethylphosphate (60.7 ml, 0.519 mol) at 100° C., with stirring. The solution was heated at 100° C. for a further 18 hrs. The reaction of the mixture was determined to be complete by analyzing a sample by 1H NMR from CDCl3. The mixture was rotary evaporated under high vacuum for 18 hrs to give a pale yellow oily product (110 ml). The purity of the product was determined to be >99% by 1H NMR analysis.

example 2

Preparation of 1-ethyl-3-methylimidazolium dimethylphosphate ([emim]Me2PO4)

[0071]A mixture of 1-ethylimidazole (50 ml, 0.519 mol) was added over a space of 4 hrs to trimethylphosphate (60.7 ml, 0.519 mol) at 120° C. with stirring. The solution was heated at 120° C. for a further 18 hrs. The reaction of the mixture was determined to be complete by analyzing a sample by 1H NMR from CDCl3. The mixture was rotary evaporated under high vacuum for 18 hrs to give a pale yellow oily product (110 ml). The purity of the product was determined to be >99% by 1H NMR analysis.

example 3

Preparation of 1-ethyl-3-methylimidazolium methylhydrogenphosphonate ([emim]MeHPO3)

[0072]A mixture of 1-ethylimidazole (50 ml, 0.519 mol) was added over a space of 4 hrs to diethylphosphite (47.6 ml, 0.519 mol) at 140° C. with stirring. The solution was heated at 140° C. for a further 18 hrs. The reaction of the mixture was determined to be complete by analyzing a sample by 1H NMR from CDCl3. The mixture was rotary evaporated under high vacuum for 18 hrs to give a pale yellow oily product (97 ml). The purity of the product was determined to be >99% by 1H NMR analysis.

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Abstract

The invention relates to a process for fibrillating lignocellulosic material wherein the process comprises treating lignocellulosic material with ionic liquid and recovering basically intact fibres of said lignocellulosic material. Another object of the invention is to provide an activated and / or basically intact fibre wherein the lignocellulosic material is treated with ionic liquid and a basically intact fibre of said lignocellulosic material is recovered. The invention further relates to the use of the basically intact fibre of the invention in the production of bio-based materials, preferably bio-plastics, more preferably conductive polymers, stimuli-responsive polymers, bio-based polymer composites, ceramics, fabrics, or elastomers. A process for producing paper, board, pulp or the like from fibers of lignocellulosic material which have been treated with ionic liquid and recovered as basically intact fibres is also enclosed.

Description

FIELD OF THE INVENTION[0001]The invention relates to a process for fibrillating lignocellulosic material wherein the process comprises treating lignocellulosic material with ionic liquid and recovering basically intact fibres of said lignocellulosic material. Typically the process comprises increasing the surface area of said lignocellulosic material. Another object of the invention is to provide an activated and / or basically intact fibre wherein the lignocellulosic material is treated with ionic liquid and a basically intact fibre of said lignocellulosic material is recovered.[0002]The invention further relates to the use of the basically intact fibre of the invention in the production of bio-based materials, preferably bio-plastics, more preferably conductive polymers, stimuli-responsive polymers, bio-based polymer composites, ceramics, fabrics, or elastomers. A process for producing paper, board, pulp or the like from fibers of lignocellulosic material which have been treated wit...

Claims

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Application Information

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IPC IPC(8): D21B1/04D21F11/00D21C9/00
CPCD21H11/18D21C9/007D21B1/02
Inventor KILPELAINEN, ILKKAKING, ALISTAIRKARHUNEN, PIRKKOMATIKAINEN, JORMA
Owner UNIVERSITY OF HELSINKI
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